examine soils and evaluate their suitability, but in a less detailed manner. Large amounts of biodegradable materials are dangerous to lakes, streams, and oceans, because organisms use dissolved oxygen in the water to break down the wastes. This can reduce or deplete the supply of oxygen in the water needed by aquatic life, resulting in fish kills, odors, and overall degradation of water quality. The amount of oxygen organisms need to break down wastes in wastewater is referred to as the biochemical oxygen demand and is one of the measurements used to assess overall wastewater strength. Organic compounds are a combination of carbon, hydrogen, oxygen, nitrogen, and other elements. Organics such as proteins, carbohydrates, and fats are biodegradable, which means they can be consumed and broken down by organisms. However, even biodegradable materials can cause pollution. In fact, too much organic matter in wastewater can be devastating to receiving waters. The unsaturated zone is
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